Title (en)

CORONA-EFFECT LOUDSPEAKER

Publication

EP 0017885 B1 19840704 (DE)

Application

EP 80101847 A 19800408

Priority

FR 7909448 A 19790413

Abstract (en)

[origin: ES8100755A1] A corona effect sound emitter including a discharge electrode producing corona discharge and surrounded by a spherical counter electrode is partially inserted in a housing which encloses a high frequency generator, modulation transformer and a power supply transformer of which the power supply transformer supplies the discharge electrode with electric current. A thin plate of a magnetic metal transversally extends in the housing so that secondary windings of the transformers are positioned above the plate and are separated from the primary windings of the transformers disposed below the plate.

IPC 1-7

H01F 31/00; H05K 9/00; H04R 23/00

IPC 8 full level

H01F 38/14 (2006.01); H02J 17/00 (2006.01); H04R 23/00 (2006.01); H05K 9/00 (2006.01)

CPC (source: EP US)

H01F 27/36 (2013.01 - EP US); H01F 27/363 (2020.08 - EP US); H05K 9/0022 (2013.01 - EP US); Y10S 336/02 (2013.01 - EP US)

Citation (examination)

• FR 1041790 A 19531027
• US 2768246 A 19561023 - SIEGFRIED KLEIN
• US 3177288 A 19650406 - BLOCK ARTHUR F, et al
• US 4306120 A 19811215 - KLEIN SIEGFRIED

Designated contracting state (EPC)

AT BE CH DE GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0017885 A1 19801029; EP 0017885 B1 19840704; AT E8311 T1 19840715; DE 3068417 D1 19840809; ES 490532 A0 19801201; ES 8100755 A1 19801201; FR 2454251 A1 19801107; FR 2454251 B1 19870612; JP S55140299 A 19801101; US 4464544 A 19840807

DOCDB simple family (application)

EP 80101847 A 19800408; AT 80101847 T 19800408; DE 3068417 T 19800408; ES 490532 A 19800412; FR 7909448 A 19790413; JP 4818980 A 19800414; US 40132382 A 19820723